div{
	/* border: 1px solid black; */
}
body{
	background-color: rgb(255,255,255);
	user-select: none;
}
.f2>.f2_header{
	margin-top: 5px;
	width: 100%;
	height: 300px;
	background-color:rgb(96,78,75) ;
	position: absolute;
	z-index: -1;
}
.f2>.container{
	margin-top: 5px;
	height: 1000px;
	display: flex;
	flex-direction: column;
	position: relative;
}
.f2>.container>a{
	display: flex;
	color:white;
	font-size: 18px;
	margin-top: 30px;
	margin-bottom: 38px;
}
.f2>.container>a:hover{
	color: rgb(255,194,16);
}
/* 小三角形 */
.f2>.container>a>div{
	width: 0px;
	height: 0px;
	border: 9px solid white ;
	border-top: 9px solid rgb(0,0,0,0)  ;
	border-bottom: 9px solid rgb(0,0,0,0) ;
	border-left: 9px solid rgb(0,0,0,0)  ;
}
.title{
	display: flex;
	flex-direction: column;
	margin-left: 40px;
}
.title>h1{
	color: white;
	font-size: 36px;
	margin-top: 30px;
	margin-bottom: 30px;
}
.title>p>span{
	color: white;
}
.title>p>span:nth-child(2){
	margin-left: 100px;
	font-size: 16px;
}
.title>span{
	color: white;
	margin-top: 70px;
}
.title_body{
	margin-left: 40px;
	width: 600px;
}
/* 课程介绍 */
.course_introduce{
	background-color: rgb(243,243,243);
	margin-top: 30px;
	margin-bottom: 10px;
	border-radius: 5px;
	box-shadow: 1px 1px 3px  gray;
}
.course_introduce>p:nth-child(1){
	color: #000000;
	font-size: 22px;
	font-family: Helvetica Neue,Helvetica,Microsoft YaHei,Arial,sans-serif;
	margin-bottom: 10px;
}
.course_introduce>p:nth-child(2){
	line-height: 38px;
	font-size: 14px;
	font-family: Helvetica Neue,Helvetica,Microsoft YaHei,Arial,sans-serif;
}

/* 讲师介绍 */
.teacher_introduce{
	background-color: rgb(243,243,243);
	margin-top: 30px;
	margin-bottom: 10px;
	border-radius: 5px;
	box-shadow: 1px 1px 3px  gray;
}
.teacher_introduce>p:nth-child(1){
	color: #000000;
	font-size: 22px;
	font-family: Helvetica Neue,Helvetica,Microsoft YaHei,Arial,sans-serif;
	margin-bottom: 10px;
}
.teacher_introduce>p:nth-child(2){
	line-height: 38px;
	font-size: 14px;
	font-family: Helvetica Neue,Helvetica,Microsoft YaHei,Arial,sans-serif;
}
/* 固定定位盒子 */
.body_rigth{
	position: absolute;
	width: 350px;
	height: 550px;
	background-color: rgb(243,243,243);
	right: 50px;
	top: 150px;
	border-radius: 10px;
	box-shadow: 1px 1px 3px 5px white;
}
.body_rigth>div{
	/* text-align: center; */
}
.body_rigth>div>img{
	width: 350px;
	border-radius: 5px;
}
.body_rigth_foot>div{
	color: #000000;
	margin-left: 10px;
	margin-top: 40px;
	margin-bottom: 10px;
}
.body_rigth_foot>p{
	display: flex;
	font-size: 12px;
	align-items: flex-end;
	margin-left: 40px;
	margin-top: 8px;
	color: #A8A8A8;
}
.body_rigth_foot>p>img{
	width: 15px;
	height: 15px;
}
.body_rigth_foot>div>button{
	width: 100%;
	height: 35px;
	background-color: rgb(255,194,16);
	color: white;
	border: none;
	font-size: 16px;
	margin-top: 40px;
}
.body_rigth_foot>div>button:nth-child(2){
	background-color: white;
	color: rgb(255,194,16);
	border: 1px solid rgb(255,194,16);
}
.teacher_introduce>p>span{
	font-size: 16px;
	color: rgb(255,194,16);
}
#kaishixuexi>a{
	color: white;
}
.erweima{
	width: 200px;
	height: 250px;
	position: absolute;
	left:-300px ;
	right: 0;
	top: 0;
	bottom: 0;
	margin: auto;
	background-color: white;
	box-shadow: 1px 1px 1px 3px #bcbcbc;
	text-align: center;
	display: none;
}
.erweima>img{
	width: 100%;
}
.erweima>span:nth-child(1){
	display: inline-block;
	color: black;
	font-size: 20px;
	font-family: Helvetica Neue,Helvetica,Microsoft YaHei,Arial,sans-serif;
	margin-top: 10px;
}
